code: def test_hierarchy_error(self):
      hierarchical_map = {
          "Plant": {
              "Flower": {"Rose": ("Pink", "Yellow", "Red")},
              "Tree": "Ash",
          }
      }
      with self.assertRaises(ValueError):
          encoders.TargetEncoder(
              verbose=1,
              smoothing=2,
              min_samples_leaf=2,
              hierarchy=hierarchical_map,
              cols=["Plant"],
          )
  
imports: import pandas
  from unittest import TestCase
  import tests.helpers
  import numpy
  from category_encoders.datasets import load_postcodes, load_compass
  import category_encoders
label_desc: Use image node_id 15 for calling the TestTargetEncoder obj's underlying member method code with example usage: obj.test_hierarchy_error() without return types